Piggy bank



FIG. 1 is a perspective view of the subject invention;

FIG. 2 is a left side elevational view of the subject invention;

FIG. 3 is a right side elevational view of the subject invention;

FIG. 4 is a front view of the subject invention;

FIG. 5 is a rear view of the subject invention;

FIG. 6 is a top plan view of the subject invention; and,

FIG. 7 is a bottom plan view of the subject invention.

The broken lines in the drawings represent unclaimed environmental subject matter. 

The ornamental design for a piggy bank, substantially as shown and described. 